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Method for determining filter coefficient of two-dimensional adaptive interpolation filter

a filter coefficient and adaptive interpolation technology, applied in the field of video data compression, can solve the problems of substantial amount of data having to be sent through conventional transmission channels of limited bandwidth or stored, and achieve the effect of efficient filter coefficient determination and less calculation

Inactive Publication Date: 2010-06-03
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0051]The two-dimensional adaptive interpolation filter of the present invention produces an advantageous effect of efficiently determining appropriate filter coefficients with less calculation.

Problems solved by technology

When video data is being transmitted or recorded, a substantial amount of data has to be sent through conventional transmission channels of limited bandwidth or has to be stored on conventional storage media of limited capacity.

Method used

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  • Method for determining filter coefficient of two-dimensional adaptive interpolation filter
  • Method for determining filter coefficient of two-dimensional adaptive interpolation filter
  • Method for determining filter coefficient of two-dimensional adaptive interpolation filter

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Embodiment Construction

[0078]Hereinafter, a video coding apparatus (video compression apparatus) in an embodiment of the present invention will be described with reference to the drawings.

[0079]The video coding apparatus in the present embodiment efficiently and appropriately calculates filter coefficients of a separable two-dimensional adaptive interpolation filter with less calculation. The video coding apparatus then performs motion compensation using the calculated filter coefficients, which makes it possible, as a result, to efficiently and appropriately code video data.

[0080]FIG. 3 is a block diagram showing an example of the video coding apparatus in the present embodiment.

[0081]A video coding apparatus 100 in the present embodiment includes a subtractor 110, a transformation and quantization unit 120, an inverse quantization and inverse transformation unit 130, an adder 135, a deblocking filter 137, a memory 140, an intra prediction unit 150, an adaptive-filter-used motion compensated prediction u...

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Abstract

A method for efficiently determining an appropriate filter coefficient of a two-dimensional adaptive interpolation filter with less calculation, the method including: a motion estimating step (S100) of estimating at sub-pel resolution, for each of blocks constituting a current picture, a motion of an image of the block from a reference picture as a motion vector; an identifying step (S102) of identifying at least one block having a motion vector specifying a sub-pel position (p, q) on the reference picture from among the blocks having motion vectors estimated at sub-pel resolution; and a determining step (S104) of determining a filter coefficient of the sub-pel position (p, q) based on an image of the at least one block identified in the identifying step and an image of at least one block of the reference picture specified by the motion vector of the at least one block identified in the identifying step.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for video data compression, and in particular to a method for determining a filter coefficient of an adaptive interpolation filter used for motion compensation.BACKGROUND ART[0002]Video data is being adopted in increasing numbers of applications, ranging from video-telephoning and video-conferencing to Digital Versatile Disk (DVD) and digital television. When video data is being transmitted or recorded, a substantial amount of data has to be sent through conventional transmission channels of limited bandwidth or has to be stored on conventional storage media of limited capacity. In order to transmit and store digital data on conventional channels and media, it is necessary to compress or reduce the volume of digital data.[0003]For the compression of video data, a plurality of video coding standards has been developed. Such video standards are, for instance, ITU-T standards denoted with H.26x and ISO / IEC standards denoted...

Claims

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Application Information

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IPC IPC(8): H04N7/26
CPCH04N19/139H04N19/176H04N19/147H04N19/523H04N19/117H04N19/174H04N19/82H04N19/46H04N19/137
Inventor WITTMANN, STEFFENWEDI, THOMAS
Owner PANASONIC CORP
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